So I got a 2020 M340i as a loaner from the dealership whilst my F80 m3 was in servicing. I raced my mate's manual BM3 Stage 2 M4 running CSF top mount cooler, catless downpipes and akrapovic exhaust. My mate was running 295 Yokohoma AD08Rs which are very sticky tyres. He did a 2nd gear launch at around 3k rpm to minimise wheel spin.
On launch, I would destroy him and then on 1st to 2nd gear shift, I would lurch forward on his m4. On 2nd to 3rd gear shift, I would lurch forward a little bit. Then during 3rd gear pull, he would pull on me hard. By the time we are around 130kmh, he would pull ahead of me.
On a roll race, he would demolish me as if I am reversing backwards on him.
Nevertheless, a stage 2 M340i would destroy a equivalent stage 2 F8X until very high speeds that's when the F8X would reel it in.